ux: unify list configuration style

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/Preferences.axaml

@@ -757,13 +757,9 @@
                     <Path Width="14" Height="14" Data="{StaticResource Icons.Plus}"/>
                   </Button>
 
-                  <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
-
                   <Button Classes="icon_button" Click="OnRemoveSelectedOpenAIService">
                     <Path Width="14" Height="14" Data="{StaticResource Icons.Minus}"/>
                   </Button>
-
-                  <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
                 </StackPanel>
               </Grid>
             </Border>

src/Views/RepositoryConfigure.axaml

@@ -242,13 +242,9 @@
                   <Path Width="14" Height="14" Data="{StaticResource Icons.Plus}"/>
                 </Button>
 
-                <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
-
                 <Button Classes="icon_button" Command="{Binding RemoveSelectedCommitTemplate}">
                   <Path Width="14" Height="14" Data="{StaticResource Icons.Minus}"/>
                 </Button>
-
-                <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
               </StackPanel>
             </Grid>
           </Border>
@@ -347,13 +343,10 @@
                   <Path Width="14" Height="14" Data="{StaticResource Icons.Plus}"/>
                 </Button>
 
-                <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
-
                 <Button Classes="icon_button" Click="OnRemoveIssueTracker">
                   <Path Width="14" Height="14" Data="{StaticResource Icons.Minus}"/>
                 </Button>
 
-                <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" HorizontalAlignment="Left" VerticalAlignment="Stretch"/>
               </StackPanel>
             </Grid>
           </Border>